Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

Exchange 2010 Queue errors, inconsistantly stops sending emails.

Avatar of hotline100
hotline100 asked on
SoftwareExchangeWindows Server 2008
5 Comments1 Solution869 ViewsLast Modified:

We are having a rather strange problem with our new exchange 2010 server.

at least once a week it seems to randomly stop sending out emails with a 421 4.2.1 and a 451 4.4.0 error.

These are email domains that we frequently send a recieve from without any issues.

we can still recieve emails, but any mails sent to an external address just stack up for a few hours with the about errors.  they will eventually send however.

We have tried recreating the send connectors, restarting the transport services as recomended but it seems to be happening more frequently.

Can anyone suggest more options?

its a MS Server 2008 and exchange 2010, new to this version so "idiot" guides would be great.

i have attached a screen shot of the error messages.

Avatar of CincyItSolutions
CincyItSolutionsFlag of United States of America image

Our community of experts have been thoroughly vetted for their expertise and industry experience.

This problem has been solved!
Unlock 1 Answer and 5 Comments.
See Answers